Bash: Some Date Functions

Some of the date functions I have had to use recently in bash shell

Get Current Date

today_date=$(date '+%Y%m%d')

(in format YYYYMMDD)

Get Yesterday

yesterday_date=$(date -d yesterday '+%Y%m%d')

(in format YYYYMMDD)

Get Day of Week

dayOfWeekNumber=$(date +%u)

(1=Mon)

dayOfWeekName=$(date +%A)

(Friday)

Could pass in a specific date:

dayOfWeekNumber=$(date -d”20190821″ +%u)

or a variable:

dayOfWeekName=$(date -d”{dateToCheck}” +%A)

Subtract Days from Date

E.g. Take 1 day from 21/08/2019

new_date=$(date -d"20190821 -1 day" +%Y%m%d)

Of course, the date and the number of days could be variables:

new_date=$(date -d”${old_date} -${num_days} day” +%Y%m%d)

 

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